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紫菜是海藻的一种，通常是用天然海藻加工而成的，并不是塑料。可能有些新闻或谣言会提及紫菜中可能含有一些人工添加剂，但这也是针对不良商家的不合格产品。购买时建议选择正规渠道和品牌，检查产品标签和检测报告，确保食材的安全与健康。